Chuck



July 28, 1942. w. E. POWELL CHUCK Filed Aug. 25, 1941 z a OR Y il L? @91,93 LLJHQI Patented July 28, 1942 UNITED STATES TENT OFFICE CHUCK William E.,Powcll, Westwood, Calif.

Application August 25, 1941, Serial No. 408,253

7 Claims.

My invention relates to new and useful improvements in chucks for holding a plurality of elements to be ground.

An important object of my invention is the provision of a device of essentially simple and compact construction that is operative to securely hold a plurality of blades or bits properly associated with each other and with a grinding tool so that all of the blades may be simultaneously shaped to a predetermined pattern.

Another object of my invention is the provision of a device of the above mentioned character that is highly ecient in its action to securely hold the blades and that will positively and automatically lock itself in the closed position until such time as it is released for renewal or turning of the blades.

Other objects and advantages of my invention, 'will be apparent during the course of the following description. f

In the drawing, forming a part of this specification, and wherein like numerals are employed to designate like parts throughout the same,

Figure l is a side elevation of a device embodying my invention and showing parts broken away for clearness of illustration,

Figure 2 is a view similar to Figure 1 but showing the chuck in a position to tightly grip the blades or bits to be ground,

Figure 3 is a top plan view of my device as illustrated in Figure l,

Figure 4 is a transverse vertical sectional view taken on the line 4-4 of Figure 2, and

Figure 5 is a longitudinal vertical sectional view of a modified form of the invention.

In the accompanying drawing, wherein for the purpose of illustration, is shown a preferred embodiment of my invention, the numeral I0 designates the attaching plate of a suitable grindinfr machine, which plate is formed with an elongated slot I I and which slot is covered by the base plate I2 embodying a part'I of my invention. The base plate is preferably formed of a relatively heavy metallic sheet or bar material though any substance suitable for the purpose may be used. It is necessary that the plate be attached to the part ID of the grinding machine in proximity to the grinding head thereof and, while any suitable means may be used to fixedly attach the base plate to the machine, I have here illustrated the same as being fixedly secured thereto by means of the bolt elements I3. It is to be understood that the mode of attaching the base plate to the machine must, of necessity, be governed by the particular type and make of the machine to which it is attached. For instance,.if the base plate is to be attached to that type of grinding machine known in the art as a side head grinder, it may be necessary to provide the base plate with a suitable shank by means of which it may be adjustably secured in the machine. In any event, it is to be understood that it is within the contemplation of my invention to provide any mode of attachment which is suitable to the particular grinding machine with which the device is associated.

The base plate is here illustrated as being of essentially rectangular formation in plan and as being provided with a flat top surface I4 for receiving the arched support or clamping plate I5. The plate I5 is preferably constructed from a suitable metallic bar material which is inherently resilient in its nature. The bar is .normally longitudinally arched and the top surface I5 thereof is formed with a plurality of spaced parallel slots I'I. The slots extend through the opposite side edges I3 and I9 of the support and open through the top surface thereof whereby to normally permit the blades or bits 20 to be easily inserted therein. To facilitate the insertion of the blades I have formed each of the slots with outwardly divergent side walls and, as clearly illustrated in the drawing, the slots are uniformly inclined from the vertical so that when the blades are inserted in the slots they will be inclined from the vertical and the upper wall of the slot will incline slightly angularly away from the top surface of the blade. The blades are of standard dimensions and the bottom of each of the slots is of a thickness substantially equal to the thickness of the blade so that the base of the blade will fit snugly therein. The slots are of uniform depth whereby to position the upper working edges of the blades in coplanar relation when a blade has been inserted in each of the slots and the support has been flexed to lie flatly against the flat top surface of the base in the manner illustrated in Figure 2.

As hereinabove described, the base plate overlies the slot Ii in the machine part It. This slot is provided for the purpose of receiving the enlarged head portion 2| of the bolt elements 22 so that the threaded shank portion of the bolts may be inserted upwardly through the openings 23 in the base and into the registering screw threaded openings 24 in the support. Any desired number of the bolts 22 may be used though I have here illustrated t'he same as being six in number and as being arranged in pairs at spaced intervals along the length of the support.

The

and to release the blades.

number of the bolts is, hou ,ver, immaterial in that it is only necessary to use a suiicient number of bolts to hold the support securely and flatly in position on the base plate during the grinding operation. By reason of the fact that the support is longitudinally arched it may be necessary to make certain of the openings 23 in the base of slightly increased diameter-t properly accommodate the inwardly inclined bolt elements carried by the ends of the support'. In any event, however, the openings should be of lesser diameter than the heads 2l of the bolts.

Theinstant invention is uniquely adapted to one operation;v Hefetoforel each of the blades L comprising the set. has been separately ground by hand' but; this method has many attendant disadvantages in that considerablezloss of'materialusually resultsdueto: the difficulty in fashioningrthe.workingifaces ofthe bits in identical formation. The' hand grindingrnethod of making the sets oflbladesxalso requires considerable time and labor.

In carrying outm'v invention I' place the sup port onV the base .platei with the-.threaded openu ings 2li in registration, with. the openings 23 in the base'Y plate. The Shanks of the; bolts 2E are then inserted upwardly' through the openings ES and: threadedinto the openings Ziiof the support; Aslsocn as the bolts havebee'n threadedinto the openings a suicient distance to move the. heads thereof intoi engagement with the under side'of the base plate they: may bei tightened by the use of Vany suitable-tool: to flex thie support whereby to` cause the same to lie. iiatly againstV the top f surface of the base. .The blades are inserted in theslots before flexing of'thesupport andthese blades generallycompriseone pattern plate which is placed inthe' endmostslot and? a plurality of blanks; of.` sufficient, number to' complete theV set required.; When thei support` is flexed the side wallsof eachof the slots move-toward each other and.clarnr.'i'r1`gly pressgagainst'theV opposite sides of tlieblades to securely hold the same against displacement. The, grinding wheel of the machine is then brought into: operative association with the upwardlyprojecting edges ofthe blades and, by using the end blade or bit asa pattern, all ofthebits may be easily and'uniformly shaped.

As soonA as. the bolts 22 are unthreaded the resilient4 support will automatically return to its normally arched position. whereby to cause the opposite side walls of the slots to spread' apart Both the operation of flexing the supporttol close the slots and the operation' of releasing the same to open the slots maybe easily and expeditiously accomplished by the use of a minimum of time and labor.

In Figure Y5 I have illustrated a modification of the invention in that the support i5 is provided with only two of theslots li. if a lesser number of slots is used, as would be the case if' only two bits were required to make a complete set, a lesser number of the bolts 22 wouldV be required Y and Figure 5 has` been illustrated as using only two of the bolts. The support I5 is similarly longitudinally arched and the side walls of the slots are outwardly divergent in the manner described for the first form of the invention.

The structural details and mode of use of this form of the invention are so similar to those set forth in connection with the first form of the invention that no further explanation is thought to be necessary.

It is to be understoodthat theform of my invention, herewith shown and described, is to be taken as a preferred example of the same, and that various changes inthe size, shape and arrangement of parts may be resorted to without departing from the spirit of my invention, or scope of the appended claims.

Having thus described my invention, I claim:

l. A chuck comprising a base having a flat surface, an arched resilient support having a plurality of spaced slots in its top surface for *receiving cutting elementsiresting uponthementicned surface of the base; andmeansfforsecuring the support to the baseV andV for applying a clamping. pressure thereto. for flexing the same flatly against' the saidsurface of the base whereby to. cause' the walls. of the slots4 to move intor pressed. engagement withv said cutting elements;

2. The combination as setr forth in claim 1 wherein. the walls of thev slots .are outwardly divergent.

3..'Ihe` combinationV as set forth in claim 1 wherein the slots are inclined from the vertical andV arranged in parallelA relation.

4.-'Ihe combination as set forth in claim 1 wherein the slots' are inclined from thegvertical and wherein the side walls'of' each of theV slots are outwardly divergent.

5.'A- chuck comprising a base having a fiat surface an arched resilient'support having provision for receiving Va plurality Vof elements mountedY on the flat surface of the base, and means for securing the Vsupport to the base and forapplying a clamping pressure' thereto` for flexing the same flatly against the mentioned surface of the base, the arrangement being such that flexing of the support will cause-thesame to tightly grip the-said elements and to present the edges thereof to beformed in coplanar relation.

6. A chuck comprising a base having a flat surface, an arched resilient support having provisionfor receiving a plurality of elements mounted on the 'at surface of the base, and clamp means operable from the under side of the base having parts extending through the base and coactingwith the support so that ac- Y tuation of the said clamp means will iiex the support to cause the same to lie flatly against the surface o-f the base and to tightly grip the said elements. Y Y

'7. A chuck comprising a base having a flat surface, an arched resilient support having a plurality of spaced slotsv in its top surface for receiving cutting elements resting upon the men- Y tioned' surface of the base,V and clamp means, operable from the underside of the base. having parts extending. through the base and coacting with the support so that` actuation of the said clamp meanswill flexthe support` to cause the same to lie flatly against the surface. of. the base" whereby to causethe-,walls of theV slots. to move into pressed engagementA with said cutting elements.

' WILLIAM E. POWELL. 

